CN105860341A - Preparation method of polyvinyl chloride hose - Google Patents
Preparation method of polyvinyl chloride hose Download PDFInfo
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- CN105860341A CN105860341A CN201610262408.5A CN201610262408A CN105860341A CN 105860341 A CN105860341 A CN 105860341A CN 201610262408 A CN201610262408 A CN 201610262408A CN 105860341 A CN105860341 A CN 105860341A
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- polyvinyl chloride
- chloride hose
- preparation
- extruder
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/005—Hoses, i.e. flexible
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a preparation method of a polyvinyl chloride hose. The polyvinyl chloride hose is prepared from 90-110 parts of polyvinyl chloride resin, 8-15 parts of dioctyl phthalate, 35-45 parts of tritolyl phosphate, 1-3 parts of lead stearate, 1-3 parts of calcium stearate, 0.1-0.5 part of stearic acid, 35-45 parts of nitrile rubber, 3-5 parts of modifier, 2-5 parts of tribasic lead sulfate, 1-3 parts of chlorinated paraffin, 1-3 parts of polyethylene wax, 2-5 parts of chlorinated polyethylene and 3-8 parts of light calcium carbonate. The preparation method of the polyvinyl chloride hose comprises the following steps: adding the heat stabilizer, plasticizer, lubricant, modifier and filler into the polyvinyl chloride resin, and carrying out high-speed mixing, granulation, extrusion, cooling for setting, drawing, cutting and detection to prepare the polyvinyl chloride hose. The polyvinyl chloride hose has the characteristics of high temperature resistance, favorable oil resistance, aging resistance, high strength, high toughness, corrosion resistance, long service life and favorable flame retardancy.
Description
Technical field
The present invention relates to PVC production technical field, be specifically related to a kind of polyvinyl chloride hose
Preparation method.
Background technology
PVC is as one of the product of development in science and technology, and PVC catches the eye in daily life
Can and, the features such as PVC pipeline has from heavy and light, corrosion-resistant, and compressive resistance is high, safe ready.
Polyvinyl chloride hose polrvinyl chloride (PVC) resin processes, by pure polrvinyl chloride (PVC)
Resin belongs to a highly polar polymer of class, and its intermolecular force is relatively big, thus result in PVC
Softening temperature and melt temperature are higher, it is generally required to 160-210 DEG C could be processed；PVC molecule
The replacement chloro being contained within is easily caused polyvinyl chloride resin dehydrochlorination reaction.Meanwhile, polrvinyl chloride
Flexible pipe also has certain defect in terms of high temperature resistant, oil resistant.
Summary of the invention
It is an object of the invention to overcome the defect problem of above-mentioned polyvinyl chloride hose, it is provided that Yi Zhongju
The preparation method of vinyl chloride flexible pipe, in Corvic add heat stabilizer, plasticizer,
Lubricant, modifying agent, filler through mixed at high speed, pelletize, extrusion, cooling and shaping, lead
Draw, cut, detect, make polyvinyl chloride hose.
For achieving the above object, the technical solution used in the present invention is:
The preparation method of a kind of polyvinyl chloride hose, described polyvinyl chloride hose is by following mass parts
One-tenth is grouped into, Corvic 90-110 part, dioctyl phthalate 8-15 part, phosphorus
Acid front three phenyl ester 35-45 part, lead stearate 1-3 part, calcium stearate 1-3 part, stearic acid
0.1-0.5 part, butadiene acrylonitrile rubber 35-45 part, modifying agent 3-5 part, tribasic lead sulfate 2-5 part,
Chlorinated paraffin 1-3 part, Tissuemat E 1-3 part, chlorinated polyethylene 2-5 part, precipitated calcium carbonate
3-8 part.
Further, described polyvinyl chloride hose is become to be grouped into by following mass parts, polrvinyl chloride
Resin 90-100 part, dioctyl phthalate 8-10 part, tricresyl phosphate 35-40 part,
Lead stearate 1-2 part, calcium stearate 1-2 part, stearic acid 0.1-0.3 part, butadiene acrylonitrile rubber 35-40
Part, modifying agent 3-4 part, tribasic lead sulfate 2-4 part, chlorinated paraffin 1-2 part, polyethylene
Wax 1-2 part, chlorinated polyethylene 2-3 part, precipitated calcium carbonate 3-5 part.
The preparation method of polyvinyl chloride hose, its preparation process is as follows,
1) first Corvic, dioctyl phthalate, phosphoric acid are chosen by described proportioning
Front three phenyl ester, lead stearate, calcium stearate, stearic acid, butadiene acrylonitrile rubber, modifying agent, three alkali formulas
Lead sulfate, chlorinated paraffin, Tissuemat E, chlorinated polyethylene, precipitated calcium carbonate, be subsequently placed in
Mixing in high-speed mixer, temperature is 100-120 DEG C, will after mixing 20-30min
It is stand-by that mixed material is cooled to 40-50 DEG C of rewinding；
2) by step 1) in collected material send in comminutor and carry out pelletize, obtain
Pellet；
3) by step 2) in put into after the granulate cooling that obtains in the barrel of extruder, control
Extruder feed temperature of breaking is 100-120 DEG C, and extruder compression section temperature is 120-140 DEG C,
Extruder metering section temperature is 140-160 DEG C, and extruder die temperature is 150-165 DEG C, squeezes
The screw speed going out machine is 30-35r/min；
4) by step 3) the cooled sizing of polyvinyl chloride hose extruded, draw, cut,
Inspection, prepares finished product.
Beneficial effects of the present invention: the preparation method of polyvinyl chloride hose of the present invention, in polychlorostyrene second
Olefine resin adds heat stabilizer, plasticizer, lubricant, modifying agent, filler through at a high speed
Mixing, pelletize, extrusion, cooling and shaping, draw, cut, detect, make polrvinyl chloride soft
Pipe；Have high temperature resistant, oil resistance good, aging resistance, intensity are high, toughness is high, corrosion-resistant,
Service life length, feature that fire resistance is good.
Detailed description of the invention
Embodiment 1
The preparation method of a kind of polyvinyl chloride hose, polyvinyl chloride hose is by following mass parts composition
Composition, Corvic 90 parts, dioctyl phthalate 8 parts, tricresyl phosphate
35 parts, lead stearate 1 part, calcium stearate 1 part, stearic acid 0.1 part, butadiene acrylonitrile rubber 35 parts,
Modifying agent 3 parts, tribasic lead sulfate 2 parts, chlorinated paraffin 1 part, Tissuemat E 1 part, chlorine
Change polyethylene 2 parts, precipitated calcium carbonate 3 parts.
The preparation method of polyvinyl chloride hose, its preparation process is as follows,
1) first Corvic, dioctyl phthalate, phosphoric acid are chosen by described proportioning
Front three phenyl ester, lead stearate, calcium stearate, stearic acid, butadiene acrylonitrile rubber, modifying agent, three alkali formulas
Lead sulfate, chlorinated paraffin, Tissuemat E, chlorinated polyethylene, precipitated calcium carbonate, be subsequently placed in
Mixing in high-speed mixer, temperature is 100 DEG C, by mixed material after mixing 30min
It is cooled to 40 DEG C of rewindings stand-by；
2) by step 1) in collected material send in comminutor and carry out pelletize, obtain
Pellet；
3) by step 2) in put into after the granulate cooling that obtains in the barrel of extruder, control
Extruder feed temperature of breaking is 100 DEG C, and extruder compression section temperature is 120 DEG C, extruder meter
Amount section temperature is 140 DEG C, and extruder die temperature is 150 DEG C, and the screw speed of extruder is
30r/min；
4) by step 3) the cooled sizing of polyvinyl chloride hose extruded, draw, cut,
Inspection, prepares finished product.
Embodiment 2
The preparation method of a kind of polyvinyl chloride hose, polyvinyl chloride hose is by following mass parts composition
Composition, Corvic 110 parts, dioctyl phthalate 15 parts, phosphate trimethylbenzene
Ester 45 parts, lead stearate 3 parts, calcium stearate 3 parts, stearic acid 0.5 part, butadiene acrylonitrile rubber 45
Part, modifying agent 5 parts, tribasic lead sulfate 5 parts, chlorinated paraffin 3 parts, Tissuemat E 3 parts,
Chlorinated polyethylene 5 parts, precipitated calcium carbonate 8 parts.
The preparation method of polyvinyl chloride hose, its preparation process is as follows,
1) first Corvic, dioctyl phthalate, phosphoric acid are chosen by described proportioning
Front three phenyl ester, lead stearate, calcium stearate, stearic acid, butadiene acrylonitrile rubber, modifying agent, three alkali formulas
Lead sulfate, chlorinated paraffin, Tissuemat E, chlorinated polyethylene, precipitated calcium carbonate, be subsequently placed in
Mixing in high-speed mixer, temperature is 120 DEG C, by mixed material after mixing 20min
It is cooled to 50 DEG C of rewindings stand-by；
2) by step 1) in collected material send in comminutor and carry out pelletize, obtain
Pellet；
3) by step 2) in put into after the granulate cooling that obtains in the barrel of extruder, control
Extruder feed temperature of breaking is 120 DEG C, and extruder compression section temperature is 140 DEG C, extruder meter
Amount section temperature is 160 DEG C, and extruder die temperature is 165 DEG C, and the screw speed of extruder is
35r/min；
4) by step 3) the cooled sizing of polyvinyl chloride hose extruded, draw, cut,
Inspection, prepares finished product.
Embodiment 3
The preparation method of a kind of polyvinyl chloride hose, polyvinyl chloride hose is by following mass parts composition
Composition, Corvic 100 parts, dioctyl phthalate 10 parts, phosphate trimethylbenzene
Ester 40 parts, lead stearate 2 parts, calcium stearate 2 parts, stearic acid 0.3 part, butadiene acrylonitrile rubber 40
Part, modifying agent 4 parts, tribasic lead sulfate 4 parts, chlorinated paraffin 2 parts, Tissuemat E 2 parts,
Chlorinated polyethylene 3 parts, precipitated calcium carbonate 5 parts.
The preparation method of polyvinyl chloride hose, its preparation process is as follows,
1) first Corvic, dioctyl phthalate, phosphoric acid are chosen by described proportioning
Front three phenyl ester, lead stearate, calcium stearate, stearic acid, butadiene acrylonitrile rubber, modifying agent, three alkali formulas
Lead sulfate, chlorinated paraffin, Tissuemat E, chlorinated polyethylene, precipitated calcium carbonate, be subsequently placed in
Mixing in high-speed mixer, temperature is 110 DEG C, by mixed material after mixing 25min
It is cooled to 45 DEG C of rewindings stand-by；
2) by step 1) in collected material send in comminutor and carry out pelletize, obtain
Pellet；
3) by step 2) in put into after the granulate cooling that obtains in the barrel of extruder, control
Extruder feed temperature of breaking is 110 DEG C, and extruder compression section temperature is 130 DEG C, extruder meter
Amount section temperature is 150 DEG C, and extruder die temperature is 160 DEG C, and the screw speed of extruder is
32r/min；
4) by step 3) the cooled sizing of polyvinyl chloride hose extruded, draw, cut,
Inspection, prepares finished product.
The preparation method of polyvinyl chloride hose of the present invention, adds thermally-stabilised in Corvic
Agent, plasticizer, lubricant, modifying agent, filler through mixed at high speed, pelletize, extrusion,
Cooling and shaping, draw, cut, detect, make polyvinyl chloride hose；Have high temperature resistant, resistance to
Oiliness energy is good, aging resistance, intensity high, toughness is high, corrosion-resistant, length in service life, anti-flammability
The feature that energy is good.
Embodiment described above is only to be described the preferred embodiment of the present invention, and
Non-the spirit and scope of the present invention are defined.In the premise without departing from design concept of the present invention
Under, various modification that technical scheme is made by this area ordinary person and improvement, all
Protection scope of the present invention should be dropped into.
Claims (3)
1. the preparation method of a polyvinyl chloride hose, it is characterised in that: described polrvinyl chloride
Flexible pipe is become to be grouped into by following mass parts, Corvic 90-110 part, phthalic acid
Dioctyl ester 8-15 part, tricresyl phosphate 35-45 part, lead stearate 1-3 part, stearic acid
Calcium 1-3 part, stearic acid 0.1-0.5 part, butadiene acrylonitrile rubber 35-45 part, modifying agent 3-5 part, three
Basic lead sulphate 2-5 part, chlorinated paraffin 1-3 part, Tissuemat E 1-3 part, chlorinated polyethylene
2-5 part, precipitated calcium carbonate 3-8 part.
2. the preparation method of polyvinyl chloride hose as claimed in claim 1, it is characterised in that:
Described polyvinyl chloride hose is become to be grouped into by following mass parts, Corvic 90-100 part,
Dioctyl phthalate 8-10 part, tricresyl phosphate 35-40 part, lead stearate 1-2
Part, calcium stearate 1-2 part, stearic acid 0.1-0.3 part, butadiene acrylonitrile rubber 35-40 part, modifying agent
3-4 part, tribasic lead sulfate 2-4 part, chlorinated paraffin 1-2 part, Tissuemat E 1-2 part,
Chlorinated polyethylene 2-3 part, precipitated calcium carbonate 3-5 part.
3. the preparation method of polyvinyl chloride hose as claimed in claim 2, it is characterised in that:
Its preparation process is as follows,
1) first Corvic, dioctyl phthalate, phosphoric acid are chosen by described proportioning
Front three phenyl ester, lead stearate, calcium stearate, stearic acid, butadiene acrylonitrile rubber, modifying agent, three alkali formulas
Lead sulfate, chlorinated paraffin, Tissuemat E, chlorinated polyethylene, precipitated calcium carbonate, be subsequently placed in
Mixing in high-speed mixer, temperature is 100-120 DEG C, will after mixing 20-30min
It is stand-by that mixed material is cooled to 40-50 DEG C of rewinding；
2) by step 1) in collected material send in comminutor and carry out pelletize, obtain
Pellet；
3) by step 2) in put into after the granulate cooling that obtains in the barrel of extruder, control
Extruder feed temperature of breaking is 100-120 DEG C, and extruder compression section temperature is 120-140 DEG C,
Extruder metering section temperature is 140-160 DEG C, and extruder die temperature is 150-165 DEG C, squeezes
The screw speed going out machine is 30-35r/min；
4) by step 3) the cooled sizing of polyvinyl chloride hose extruded, draw, cut,
Inspection, prepares finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610262408.5A CN105860341A (en) | 2016-04-21 | 2016-04-21 | Preparation method of polyvinyl chloride hose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610262408.5A CN105860341A (en) | 2016-04-21 | 2016-04-21 | Preparation method of polyvinyl chloride hose |
Publications (1)
| Publication Number | Publication Date |
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| CN105860341A true CN105860341A (en) | 2016-08-17 |
Family
ID=56629131
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| CN201610262408.5A Pending CN105860341A (en) | 2016-04-21 | 2016-04-21 | Preparation method of polyvinyl chloride hose |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106566125A (en) * | 2016-10-28 | 2017-04-19 | 无锡市永兴金属软管有限公司 | Siphon pipe for printing and dyeing, and preparation method thereof |
| CN106566135A (en) * | 2016-10-27 | 2017-04-19 | 苏州富通高新材料科技股份有限公司 | Nanometer PVC pipe and preparation method thereof |
| CN106566136A (en) * | 2016-10-28 | 2017-04-19 | 无锡市永兴金属软管有限公司 | Hose and preparation method thereof |
| CN106589659A (en) * | 2016-10-28 | 2017-04-26 | 无锡市永兴金属软管有限公司 | Compression-resistant durable composite material for air hose |
| CN106700332A (en) * | 2016-12-14 | 2017-05-24 | 安徽圣源橡塑科技有限公司 | PVC heat-resistant hose formula |
| CN106854301A (en) * | 2016-11-30 | 2017-06-16 | 东阳市朗晟橡塑有限公司 | A kind of multipurpose novel rubber tube and preparation method thereof |
| CN107057212A (en) * | 2016-11-30 | 2017-08-18 | 东阳市朗晟橡塑有限公司 | A kind of heatproof super-elasticity plastic flexible pipe and preparation method thereof |
| CN107337873A (en) * | 2017-06-12 | 2017-11-10 | 芜湖天航科技（集团）股份有限公司 | polyvinyl chloride hose and preparation method thereof |
| CN108864617A (en) * | 2018-07-24 | 2018-11-23 | 苏州环亚软管塑业有限公司 | A kind of preparation method of stretch-proof plastic hose |
| CN109082029A (en) * | 2018-07-03 | 2018-12-25 | 安徽海丰新材料科技有限公司 | A kind of heat-resistant PVC pipe formula |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106566135A (en) * | 2016-10-27 | 2017-04-19 | 苏州富通高新材料科技股份有限公司 | Nanometer PVC pipe and preparation method thereof |
| CN106566125A (en) * | 2016-10-28 | 2017-04-19 | 无锡市永兴金属软管有限公司 | Siphon pipe for printing and dyeing, and preparation method thereof |
| CN106566136A (en) * | 2016-10-28 | 2017-04-19 | 无锡市永兴金属软管有限公司 | Hose and preparation method thereof |
| CN106589659A (en) * | 2016-10-28 | 2017-04-26 | 无锡市永兴金属软管有限公司 | Compression-resistant durable composite material for air hose |
| CN106854301A (en) * | 2016-11-30 | 2017-06-16 | 东阳市朗晟橡塑有限公司 | A kind of multipurpose novel rubber tube and preparation method thereof |
| CN107057212A (en) * | 2016-11-30 | 2017-08-18 | 东阳市朗晟橡塑有限公司 | A kind of heatproof super-elasticity plastic flexible pipe and preparation method thereof |
| CN106700332A (en) * | 2016-12-14 | 2017-05-24 | 安徽圣源橡塑科技有限公司 | PVC heat-resistant hose formula |
| CN107337873A (en) * | 2017-06-12 | 2017-11-10 | 芜湖天航科技（集团）股份有限公司 | polyvinyl chloride hose and preparation method thereof |
| CN109082029A (en) * | 2018-07-03 | 2018-12-25 | 安徽海丰新材料科技有限公司 | A kind of heat-resistant PVC pipe formula |
| CN108864617A (en) * | 2018-07-24 | 2018-11-23 | 苏州环亚软管塑业有限公司 | A kind of preparation method of stretch-proof plastic hose |
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